This is the BRID Duct Rail Fan DC Basic 40 White. This is a small fan specifically for duct rails that attaches to the lighting duct rail on the ceilings of homes, shops, and offices to promote air circulation. With the included remote control, you can turn it on and off, making ventilation and circulation easy regardless of location. Installation and removal are simple with a one-touch mechanism. At φ40cm, it is compact and lightweight, making it suitable for environments where installing large ceiling fans is difficult, or for relatively small rooms like restrooms. It's a thoughtful item that can easily upgrade your living environment. I purchased this in March 2026 and tried installing it. It was really good, but a slightly larger size would be better for my home, so I'm listing it for sale with the intention of purchasing a larger one once this sells. It has only been 3 days since installation.